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  • Boiler question

    I have 2 1,000,000 btu super hot boilers and when I went to check the prv valves both of them started to hammer and wouldnt stop untill I lifted the handle 3 times are so.

    I check these vales on a regular bassis and dont understand why both of them would do this at the same time??

  • #2
    check the pressure on the system and compare that to the relief valve name plate. sounds like the pressure is very close to the relief valve setting.

    rick.
    phoebe it is

    Comment


    • #3
      after you check the pressure , check your expantion tank that the pressure is right .
      Charlie

      My seek the peek fundraiser page
      http://observatory.mountwashington.o...nal&fr_id=1040


      http://www.mountwashington.org/weather/conditions.php

      new work pictures 12/09
      http://public.fotki.com/hvachawk/

      Comment


      • #4
        I agree with HVAC, if your expansion tanks are water logged and have no air space in them, when the system fires and heats up the water in the system will expand causing the relief valves to open.

        Comment


        • #5
          Ok I checked the pressures.
          The first pump is reading 25 and the second is reading 45??

          Both expansion tanks are reading 18.5

          the PRV only hammers when I lift up to do my monthy test on them.

          Comment


          • #6
            do you have the diaphragm type tank.
            if so you need to check the pressure with out the boiler pressure on it.

            1-what is your boiler pressure with out the pumps running.

            2-where is the boiler makeup water going into the boiler.

            3-how many floors are you heating,this will determine what the boiler pressure should be .
            Charlie

            My seek the peek fundraiser page
            http://observatory.mountwashington.o...nal&fr_id=1040


            http://www.mountwashington.org/weather/conditions.php

            new work pictures 12/09
            http://public.fotki.com/hvachawk/

            Comment


            • #7
              1.The boilers will not run unless the pumps are running.

              2.The boilers are a closed loop.`hot water`

              3. Three floors.

              And yes the expansion tanks are the bladder type.

              Comment


              • #8
                Originally posted by gobby
                1.The boilers will not run unless the pumps are running.
                OK but what is the pressure in the boiler when it is cold and the pumps not runing
                2.The boilers are a closed loop.`hot water`
                most boilers are closed loop but they still need to have water added to them to maintain the proper pressure .the only boilers i put in that i did not put a water makeup in was when we put antifreeze in it to keep it from freezing.if we add water we lower the freezing point.
                3. Three floors.
                we normally set the boiler pressure for 2 floors at 10 to 13 pounds and 14 to17 pounds .the higher the water has to go the more pressure you need .you need to have the same pressure in the expansion tonk
                i hope this helps

                And yes the expansion tanks are the bladder type.
                Charlie

                My seek the peek fundraiser page
                http://observatory.mountwashington.o...nal&fr_id=1040


                http://www.mountwashington.org/weather/conditions.php

                new work pictures 12/09
                http://public.fotki.com/hvachawk/

                Comment


                • #9
                  The preasure in the boilers is 18.5 same the the expansion tanks.with the boilers not in operation.

                  Comment


                  • #10
                    the pressure does not look like thats the problem .

                    check to see if the BTU rating on the prv matches the boiler BTUs .

                    and if thats ok then the prv just may be worn and need to be changed.

                    i will ask at work tomorrow and see if some one can give me some other ideas
                    Charlie

                    My seek the peek fundraiser page
                    http://observatory.mountwashington.o...nal&fr_id=1040


                    http://www.mountwashington.org/weather/conditions.php

                    new work pictures 12/09
                    http://public.fotki.com/hvachawk/

                    Comment


                    • #11
                      I changed one prv valve 2 months ago?and both valves are doing it?

                      The valves are 50 pond rating.??
                      Just wanted to say for your help hawk means allot to me brother!

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